ToolNest / Developer Tools

ToolNest Collection

Developer Tools Online

Practical developer utilities for formatting, validating, testing, and converting code-adjacent data directly in the browser.

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Featured tools in this collection

JSON Formatter Regular Expression Tester Color Value Converter Crontab Next Run Calculator JSON to TypeScript Types SQL Formatter & Minifier

Real use cases

Format, validate, repair, and inspect JSON from APIs or logs.
Test regular expressions and replacements before using them in code.
Preview cron schedules and convert color values for UI work.

Example workflow

Example: paste unformatted JSON, validate it, inspect tree paths, and copy the formatted output for debugging notes.

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